이렇게 정의된 Makefile을 볼 수 있을 것이다.
all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
여기에서 make, modules, clean은 target인 것 같고 나머지는 옵션... 같은데 미리 정의된 것인듯 하다. 이에 대한 설명이 없어 찾아본 결과 다음 경로에서 아래의 내용을 찾을 수 있었다.
커널 소스 내 Documentation/kbuild/module.txt
--- 2.2 Options 87 88 ($KDIR refers to the path of the kernel source directory.) 89 90 make -C $KDIR M=$PWD 91 92 -C $KDIR 93 The directory where the kernel source is located. 94 "make" will actually change to the specified directory 95 when executing and will change back when finished. 96 97 M=$PWD 98 Informs kbuild that an external module is being built. 99 The value given to "M" is the absolute path of the 100 directory where the external module (kbuild file) is 101 located. 102 103 --- 2.3 Targets 104 105 When building an external module, only a subset of the "make" 106 targets are available. 107 108 make -C $KDIR M=$PWD [target] 109 110 The default will build the module(s) located in the current 111 directory, so a target does not need to be specified. All 112 output files will also be generated in this directory. No 113 attempts are made to update the kernel source, and it is a 114 precondition that a successful "make" has been executed for the 115 kernel. 116 117 modules 118 The default target for external modules. It has the 119 same functionality as if no target was specified. See 120 description above. 121 122 modules_install 123 Install the external module(s). The default location is 124 /lib/modules/<kernel_release>/extra/, but a prefix may 125 be added with INSTALL_MOD_PATH (discussed in section 5). 126 127 clean 128 Remove all generated files in the module directory only. 129 130 help 131 List the available targets for external modules.
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